Portion of navigation system



FIG. 1 is a front view of a portion of navigation system showing our new design; and,

FIG. 2 is a front view illustrating an illuminated panel of the portion of navigation system in an in use state.

The broken lines shown are included for the purpose of illustrating the unclaimed portions of the article and form no part of the claim. 

CLAIM The ornamental design for a portion of navigation system, as shown and described. 